Knighton played for the Redskins on a one-year deal in 2015. Known as a run-stuffer, "Pot Roast" provided the roster with a positive locker room presence and major impediment for opposing offensive lines. However, Washington ranked 26th in rushing yards allowed per game and 31st in yards per play allowed on the ground last season. Combined with weight concerns, Knighton received just a middling grade for his 2015 work, though the defense needed upgrades on all three levels.

The allure of playing for the perennial Super Bowl contenders in New England must be appealing. At the same, Knighton's childhood pal Chris Baker remains in Washington.and there were apparently no hard feelings when he wasn't re-signed.